Semiconductor device package and method of manufacturing the same

ABSTRACT

A semiconductor device package and a method of manufacturing the same are provided. The semiconductor device package includes a first semiconductor element, a first redistribution layer, a second redistribution layer, and a conductive via. The first semiconductor element has a first active surface and a first back surface opposite to the first active surface. The first redistribution layer is disposed adjacent to the first back surface of the first semiconductor element. The second redistribution layer is disposed adjacent to the first active surface of the first semiconductor element. The conductive via is disposed between the first redistribution layer and the second redistribution layer, where the conductive via inclines inwardly from the second redistribution layer to the first redistribution layer.

TECHNICAL FIELD

The present disclosure relates to a semiconductor device package and a method of manufacturing the same, and more particularly, to a semiconductor device package that can improve the signal transmission speed of the electrical connections.

DESCRIPTION OF THE RELATED ART

Nowadays, techniques for incorporating more than one semiconductor element into a single semiconductor package to minimize the dimensions of the package are under progressively development. Flip-chip bonding technique is one way to stack one semiconductor element onto another and electrically connect them. Typically, flip-chip bonding requires solder electrical connections. Nevertheless, utilizing solder materials for electrical connections may inevitably cause an RC delay problem, which may reduce signal transmission speed. In addition, intermetallic coverage (IMC) may be formed between the solder material and the other metals, which may also cause poor conductivity.

Given the above, it would be desirable to provide semiconductor packages with electrical connections offering faster transmission speed and at the same time satisfy industry needs for miniaturization.

SUMMARY

In an aspect, a semiconductor device package includes a first semiconductor element, a first redistribution layer, a second redistribution layer, and a conductive via. The first semiconductor element has a first active surface and a first back surface opposite to the first active surface. The first redistribution layer is disposed adjacent to the first back surface of the first semiconductor element. The second redistribution layer is disposed adjacent to the first active surface of the first semiconductor element. The conductive via is disposed between the first redistribution layer and the second redistribution layer, where the conductive via inclines inwardly from the second redistribution layer to the first redistribution layer.

In an aspect, a semiconductor device package includes a first semiconductor element, a first redistribution layer, a second redistribution layer, and a second semiconductor element. The first semiconductor element has a first active surface and a first back surface opposite to the first active surface. The first redistribution layer is disposed adjacent to the first back surface of the first semiconductor element. The second redistribution layer is disposed adjacent to the first active surface of the first semiconductor element. The second semiconductor element has a second active surface and a second back surface opposite to the second active surface, where the second active surface directly bonds to the first redistribution layer.

In an aspect, a method of manufacturing a semiconductor device package includes: providing a first semiconductor element having a first active surface and a first back surface opposite to the first active surface; disposing a first redistribution layer adjacent to the first active surface of the first semiconductor element; disposing a second semiconductor element adjacent to the first redistribution layer, wherein the second semiconductor element has a second active surface and a second back surface opposite to the second active surface and the second back surface faces the first redistribution layer; molding the second semiconductor element to form a first encapsulant surrounding the second semiconductor element; forming a conductive via in the first encapsulant; and disposing a second redistribution layer adjacent to the second active surface of the second semiconductor element.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1A illustrates a cross-sectional view of a semiconductor device package according to some embodiments of the present disclosure.

FIG. 1B illustrates an enlarged view of an area A of the semiconductor device package illustrated in FIG. 1A according to some embodiments of the present disclosure.

FIG. 1C illustrates an enlarged view of an area A of the semiconductor device package of FIG. 1A according to some embodiments of the present disclosure.

FIG. 1D illustrates an enlarged view of an area A of the semiconductor device package of FIG. 1A according to some embodiments of the present disclosure.

FIG. 2A illustrates an enlarged view of an area B of the semiconductor device package of FIG. 1A according to some embodiments of the present disclosure.

FIG. 2B illustrates an enlarged view of an area B of the semiconductor device package of FIG. 1A according to some embodiments of the present disclosure.

FIG. 3 illustrates a cross-sectional view of a semiconductor device package according to some embodiments of the present disclosure.

FIG. 4 illustrates a cross-sectional view of a semiconductor device package according to some embodiments of the present disclosure.

FIG. 5A, FIG. 5B, FIG. 5C, FIG. 5D, FIG. 5E, FIG. 5F, FIG. 5G, FIG. 5H, FIG. 5I, FIG. 5J, FIG. 5K, FIG. 5L, FIG. 5M, FIG. 5N, FIG. 5O, FIG. 5P, and FIG. 5Q illustrate a method of manufacturing a semiconductor device package such as the semiconductor device package of FIG. 1A.

FIG. 6A, FIG. 6B, FIG. 6C, FIG. 6D, FIG. 6E, FIG. 6F, FIG. 6G, FIG. 6H, FIG. 6I, FIG. 6J, FIG. 6K, FIG. 6L, FIG. 6M, FIG. 6N, and FIG. 6O illustrate a method of manufacturing a semiconductor device package such as the semiconductor device package of FIG. 3.

DETAILED DESCRIPTION

Spatial descriptions, such as “above,” “top,” and “bottom” and so forth, are indicated with respect to the orientation shown in the figures unless otherwise specified. It should be understood that the spatial descriptions used herein are for purposes of illustration only, and that practical implementations of the structures described herein can be spatially arranged in any orientation or manner, provided that the merits of embodiments of this disclosure are not deviated by such arrangement.

In some embodiments, the present disclosure provides a semiconductor device package including a first semiconductor element, a first redistribution layer, a second redistribution layer, and a conductive via. The conductive via is disposed between the first redistribution layer and the second redistribution layer so an electrical signal may be transmitted from one side of the first redistribution layer to the other side of the second redistribution layer. In addition, since the conductive via is formed by a laser drilling technique or a mechanical drilling technique followed by a plating technique, the conductive via may have a higher aspect ratio compared to a conductive via disposed by picking and placing a preformed one, which may in turn results in a higher number of electrical connections (i.e., higher I/Os) as it requires less surface area than a conventional one.

In some embodiments, the present disclosure provides a semiconductor device package including a first semiconductor element, a first redistribution layer, a second redistribution layer, and a second semiconductor element. The second semiconductor element has a second active surface and a second back surface opposite to the second active surface, wherein the second active surface directly bonds to the first redistribution layer. By the techniques provided in the present disclosure, directing bonding the second semiconductor element to the first redistribution layer becomes possible and so is a solder-free flip-chip technique. Therefore, according to the semiconductor device package of the present disclosure, superior advantages of a flip-chip technique, including higher I/Os, superior heat dissipation effect and flexibility for further improvement, and reduction of package size, and advantages of a solder-free technique including reducing solder contamination possibilities can be achieved.

FIG. 1A illustrates a cross-sectional view of a semiconductor device package according to some embodiments of the present disclosure. The semiconductor device package 100 of FIG. 1A includes a first semiconductor element 101, a first redistribution layer 103, a second redistribution layer 105, and a conductive via 107.

The first semiconductor element 101 has a first active surface 101 a and a first back surface 101 b opposite to the first active surface 101 a. The first semiconductor element 101 may be a die, a chip, a package, an interposer, or a combination thereof. In some embodiments, the first semiconductor element 101 is a die. At least one first conductive terminal 102 a may be disposed adjacent to the first active surface 101 a of the first semiconductor element 101 for external electrical connection.

The first redistribution layer (RDL) 103 is disposed adjacent to the first back surface 101 b of the first semiconductor element 101. In some embodiments, the first RDL 103 is disposed on (e.g., physical contact) the first back surface 101 b of the first semiconductor element 101. The first RDL 103 may include a single layer containing a dielectric layer and at least one conductive trace disposed thereon (or embedded therein) or include multiple layers which have multiple dielectric layers stacked together where each has at least one conductive trace disposed thereon (or embedded therein) for redistributing electrical signals to external electrical connectors or to another RDL. In some embodiments, such as the one illustrated in FIG. 1A, the first RDL 103 includes a first bottom RDL 103 a, a first middle RDL 103 b, and a first top RDL 103 c, which may include a portion of the conductive traces that electrically connect to each other vertically, a portion of the conductive traces that electrically connect to each other horizontally, or both.

The first bottom RDL 103 a may be the outmost layer of the first RDL 103 and disposed adjacent to the first back surface 101 b of the first semiconductor element 101. The first bottom RDL 103 a may include a first bottom RDL dielectric layer 104 a and a first bottom RDL conductive trace 104 b disposed on (e.g., physical contact or embedded in and exposed by) the first bottom RDL dielectric layer 104 a. The first bottom RDL conductive trace 104 b may electrically connect to the first middle RDL conductive trace 106 b of the first middle RDL 103 b The first bottom RDL dielectric layer 104 a may include, for example, one of, or a combination of, a photosensitive material (e.g., polyimide (PI), polyamide (PA), or other suitable materials), an epoxy material, a resin material (e.g., Ajinomoto Build-up Film (ABF)), cyclophentadiene (CPD), poly-p-phenylene benzobisoxazole (PBO), a solder mask material, a fiber, and an inorganic material (e.g., Ta₂O₅, SiO₂, Si₃N₄, or other suitable materials). In some embodiments, the first bottom RDL dielectric layer 104 a includes polyimide. In some embodiments, the first bottom RDL conductive trace 104 b may include, for example, one of, or a combination of, copper, gold, indium, tin, silver, palladium, osmium, iridium, ruthenium, titanium, magnesium, aluminum, cobalt, nickel, or zinc, or other metals or metal alloys.

The first top RDL 103 c may be the outmost layer of the first RDL 103 and disposed adjacent to the first middle RDL 103 b. The first top RDL 103 c may include a first top RDL dielectric layer 118 a and a first top RDL conductive trace 118 b disposed on (e.g., physical contact or embedded in and exposed by) the first top RDL dielectric layer 118 a. The first top RDL conductive trace 118 b may electrically connect to the first middle RDL 103 b. The first top RDL dielectric layer 118 a may include, for example, one of, or a combination of, a photosensitive material (e.g., polyimide (PI), polyamide (PA), or other suitable materials), an epoxy material, a resin material (e.g., Ajinomoto Build-up Film (ABF)), cyclophentadiene (CPD), poly-p-phenylene benzobisoxazole (PBO), a solder mask material, a fiber, and an inorganic material (e.g., Ta₂O₅, SiO₂, Si₃N₄, or other suitable materials). In some embodiments, the first top RDL dielectric layer 118 a includes polyimide. In some embodiments, the first top RDL conductive trace 118 b may include, for example, one of, or a combination of, copper, gold, indium, tin, silver, palladium, osmium, iridium, ruthenium, titanium, magnesium, aluminum, cobalt, nickel, or zinc, or other metals or metal alloys.

At least one second conductive terminal 132 may be disposed adjacent to a surface of the first top RDL 103 c for external electrical connection.

The second redistribution layer (RDL) 105 is disposed adjacent to the first active surface 101 a of the first semiconductor element 101. In some embodiments, the second RDL 105 is disposed above the first active surface 101 a of the first semiconductor element 101. In some embodiments, the second RDL 105 electrically connects to the first active surface 101 a of the first semiconductor element 101.

The second RDL 105 may include a single layer containing a dielectric layer and at least one conductive trace disposed thereon (or embedded therein) or include multiple layers which have dielectric layers stacked together where each has at least one conductive trace disposed thereon (or embedded therein) for redistributing electrical signals to external electrical connectors or to another RDL. In some embodiments, such as the one illustrated in FIG. 1A, the second RDL 105 only includes a single layer containing a second RDL dielectric layer 105 a and at least one second RDL conductive trace 124 b disposed thereon (or embedded therein and exposed thereby). In some embodiments, the second RDL 105 a electrically connects to the first active surface 101 a of the first semiconductor element 101 and provide external electrical connection for the first semiconductor element 101. The second RDL dielectric layer 105 a may include, for example, one of, or a combination of, a photosensitive material (e.g., polyimide (PI), polyamide (PA), or other suitable materials), an epoxy material, a resin material (e.g., Ajinomoto Build-up Film (ABF)), cyclophentadiene (CPD), poly-p-phenylene benzobisoxazole (PBO), a solder mask material, a fiber, and an inorganic material (e.g., Ta₂O₅, SiO₂, Si₃N₄, or other suitable materials). In some embodiments, the second RDL dielectric layer 105 a includes polyimide. In some embodiments, the second RDL conductive trace 124 b may include, for example, one of, or a combination of, copper, gold, indium, tin, silver, palladium, osmium, iridium, ruthenium, titanium, magnesium, aluminum, cobalt, nickel, or zinc, or other metals or metal alloys.

At least one third conductive terminal 120 a, 120 b may be disposed adjacent to a surface of the second RDL 105 a for external electrical connection. In some embodiments, the second RDL 105 a electrical connects to the first active surface 101 a of the first semiconductor element 101 through the third conductive terminal 120 b and the conductive via 107 through the third conductive terminal 120 a.

The conductive via 107 is disposed between the first RDL 103 and the second RDL 105. The conductive via 107 inclines inwardly from the second RDL 105 to the first RDL 103. The conductive via 107 may electrically connect to the first RDL 103, the second RDL 105, or both. In some embodiments, the conductive via 107 electrically connects the first RDL 103 to the second RDL 105 so an electrical signal may be transmitted from one side of the first RDL 103 to the other side of the second RDL 105. In some embodiments, the conductive via 107 electrically connects to the first RDL 103 through connecting to the first bottom RDL conductive trace 104 b of the first bottom RDL 103 a and electrically connects to the second RDL 105 through connecting to the third conductive terminal 120 a. Since the conductive via 107 is formed by a laser drilling technique or a mechanical drilling technique followed by a plating technique, the conductive via 107 may have a higher aspect ratio compared to a conductive via disposed by a pick and place technique where the conductive via may be disposed by picking and placing a preformed conductive column, which may in turn results in a higher number of electrical connections (i.e., higher I/Os) as a conductive column requires more surface area than the conductive via 107 of the present disclosure. The aspect ratio of the conductive via 107 may range from 1:1 to 1:10, 1:2.5 to 1:10, 1:5 to 1:10, or 1:7 to 1:10. In some embodiments, the aspect ratio of the conductive via 107 ranges from 1:5 to 1:10.

In some embodiments, a first encapsulant 111 may be disposed between the first RDL 103 and the second RDL 105. The first encapsulant 111 has a first encapsulant top surface 111 a and a first encapsulant bottom surface 111 b opposite to the first encapsulant top surface 111 a. In some embodiments, the first encapsulant top surface 111 a and the via top surface 107 a of the conductive via 107 are in substantially the same plane. In some embodiments, the first encapsulant bottom surface 111 b and the via bottom surface 107 b of the conductive via 107 are in substantially the same plane. In some embodiments, the first encapsulant top surface 111 a, the via top surface 107 a of the conductive via 107, and the first back surface 101 b of the first semiconductor element 101 are in substantially the same plane.

The first encapsulant 111 may surround the conductive via 107. In some embodiments, the first encapsulant 111 and the conductive via 107 are connected at a first interface 107 c. The first encapsulant 111 may surround the first semiconductor element 101. In some embodiments, the first encapsulant 111 surrounds the conductive via 107 and the first semiconductor element 101. In some embodiments, the first encapsulant 111 surrounds the conductive via 107 and the first semiconductor element 101 and covers at least a portion of the first active surface 101 a of the first semiconductor element 101. In some embodiments, the first encapsulant 111 surrounds the first conductive terminal 102 a disposed adjacent to the first active surface 101 a of the first semiconductor element 101 and/or the second conductive terminal 120 b disposed adjacent to a surface of the second RDL 105 a to protect them from oxidation, moisture, and other environment conditions to meet the packaging application requirements. The first encapsulant 111 may be, for example, a solder mask (the material of which is, for example, polyimide (PI)), a passivation layer (the material of which is, for example, a metal oxide), or an underfill. The first encapsulant 111 may include fillers, the material of which is, for example, silica and/or carbon for reducing stress on the die and warpage of a resulting semiconductor package.

In some embodiments, a first seed layer 108 may be further included in the conductive via 107. The first seed layer 108 may be disposed in the recess 119 of the first encapsulant 111. In some embodiments, the first seed layer 108 is disposed on the sidewall 107 c of the recess 119 of the first encapsulant 111. In some embodiments, the first seed layer 108 is disposed in conformity with the sidewall 107 c of the first encapsulant 111. At least a portion of the top surface 108 a of the first seed layer 108 may be exposed by the first encapsulant top surface 111 a of the first encapsulant 111 and in contact with the first RDL 103. At least a portion of the bottom surface 108 b may be exposed by the first encapsulant bottom surface 111 b of the first encapsulant 111 and in contact with the second RDL 105. At least a portion of the top surface 108 a of the first seed layer 108 may be in substantially the same plane with the first encapsulant top surface 111 a of the first encapsulant 111. At least a portion of the bottom surface 108 b may be in substantially the same plane with the first encapsulant bottom surface 111 b of the first encapsulant 111.

In some embodiments, at least one second semiconductor element 109 may be disposed adjacent to the first RDL 103. The second semiconductor element 109 may electrically connect to the first RDL 103. In some embodiments, the second semiconductor element 109 electrically connects to the first RDL 103 through the fourth conductive terminal 110 disposed adjacent to the second active surface 109 a of the second semiconductor element 109 and the second conductive terminal 132 disposed adjacent to a surface of the first top RDL 103 c. The second semiconductor element 109 may be a die, a chip, a package, an interposer, or a combination thereof. In some embodiments, the second semiconductor element 109 is a die.

In some embodiments, a second encapsulant 113 may be disposed adjacent to the first top surface 103 e of the first RDL 103. The second encapsulant 113 has a second encapsulant top surface 113 a and a second encapsulant bottom surface 113 b opposite to the second encapsulant top surface 113 a. In some embodiments, the second encapsulant top surface 113 a exposes at least a portion of the second back surface 109 b of the second semiconductor element 109. By exposing at least a portion of the second back surface 109 b of the second semiconductor element 109, the heat dissipation effect of the second semiconductor element 109 may be improved. In some embodiments, a heat sink may be further disposed adjacent to the exposed portion of the second back surface 109 b of the second semiconductor element 109 to further improve the heat dissipation effect. In some embodiments, the second encapsulant top surface 113 a covers the second back surface 109 b of the second semiconductor element 109 entirely (e.g., the second semiconductor element 109 is embedded in the second encapsulant 113). In some embodiments, the second encapsulant top surface 113 a of the second encapsulant 113 and the second back surface 109 b of the second semiconductor element 109 are in substantially the same plane.

The second encapsulant 113 may surround the fourth conductive terminal 110 disposed adjacent to the second active surface 109 a of the second semiconductor element 109 and/or the second conductive terminal 132 disposed adjacent to a surface of the first top RDL 103 c to protect them from oxidation, moisture, and other environment conditions to meet the packaging application requirements. The second encapsulant 113 may be, for example, a solder mask (the material of which is, for example, polyimide (PI)), a passivation layer (the material of which is, for example, a metal oxide), or an underfill. The second encapsulant 113 may include fillers, the material of which is, for example, silica and/or carbon for reducing stress on the die and warpage of a resulting semiconductor package.

In some embodiments, at least one electrical connector 123 may be disposed adjacent to the second bottom surface 105 f of the second RDL 105. In some embodiments, the electrical connector 123 electrically connects to the second RDL 105. In some embodiments, the electrical connector 123 electrically connects to the second RDL 105 by connecting to a bonding pad 122 b disposed adjacent to the second bottom surface 105 f of the second RDL 105. The electrical connector 123 may be a pillar or a solder/stud bump. In some embodiments, the electrical connector 123 is a solder bump and the bonding pad 122 b is a ball pad.

FIG. 1B illustrates an enlarged view of an area A of the conductive via 107 and the first encapsulant 111 of the semiconductor device package of FIG. 1A according to some embodiments of the present disclosure. In some embodiments, the first encapsulant 111 and the conductive via 107 are connected at a first interface 107 c. The first interface 107 c may be an uneven surface if a laser drilling technique is applied to form a via in the first encapsulant 111 for the conductive via 107. Due to the impact of the high power laser drilling, it may cause an uneven or rough surface when the laser goes through the first encapsulant 111. The rough or uneven surface of the first encapsulant 111 may improve the bonding effect between the first encapsulant 111 and the first seed layer 108 depositing thereon by providing more reaction sites on the surface. The first encapsulant 111 may include fillers. In some embodiments where a laser drilling is applied and the first encapsulant 111 includes fillers 112, the fillers at the first interface 107 c are not intact in shape as they are damaged by it.

FIG. 1C illustrates an enlarged view of an area A of the conductive via 107 and the first encapsulant 111 of the semiconductor device package of FIG. 1A according to some embodiments of the present disclosure. The embodiments illustrated in FIG. 1C are different from those illustrated in FIG. 1B in that the laser power utilized in FIG. 1C is higher than that utilized in FIG. 1B (e.g., with smaller wavelength) so the fillers at the first interface 107 c may be vaporized by such power and only recess 114 may be left at the first interface 107 c. Due to the uneven surface caused by the laser drilling, the bonding effect between the first encapsulant 111 and the first seed layer 108 depositing thereon may be improved for the reasons described above.

FIG. 1D illustrates an enlarged view of an area A of the conductive via 107 and the first encapsulant 111 of the semiconductor device package of FIG. 1A according to some embodiments of the present disclosure. The embodiments illustrated in FIG. 1D are different from those illustrated in FIG. 1A in that the first encapsulant 111 is drilled by a mechanical drilling technique, rather than a laser drilling technique so the fillers 116 may remain intact at the first interface 107 c. Contrary to those fillers 112 that cannot remain intact in shape as they are damaged by a laser drilling process for forming the conductive via, the effect of the fillers 116, for example, in reducing stress or warpage of a resulting semiconductor package can be sustained.

FIG. 2A illustrates an enlarged view of an area B of the fourth conductive terminal 110 and the second conductive terminal 132 of the semiconductor device package 100 of FIG. 1A according to some embodiments of the present disclosure. The fourth conductive terminal 110 may electrically connect to the second conductive terminal 132. In some embodiments, such as those illustrated in FIG. 2A, the fourth conductive terminal 110 electrically connects to the second conductive terminal 132 by a hybrid bonding technique.

The fourth conductive terminal 110 is disposed adjacent to the second active surface 109 a of the second semiconductor element 109. In some embodiments, the fourth conductive terminal 110 electrically connects to the second active surface 109 a of the second semiconductor element 109. The fourth conductive terminal 110 may include a fourth bonding pad 110 a, a fourth insulation layer 110 b, a fourth electrical connector 110 c, and a fourth metal layer 110 d.

The fourth bonding pad 110 a is disposed adjacent to the second active surface 109 a of the second semiconductor element 109. In some embodiments, the fourth bonding pad 110 a is disposed on (e.g., physical contact or embedded in and exposed by) the second active surface 109 a of the second semiconductor element 109.

The fourth insulation layer 110 b is disposed adjacent to the second active surface 109 a of the second semiconductor element 109. In some embodiments, the fourth insulation layer 110 b is disposed adjacent to the fourth bonding pad 110 a. The fourth insulation layer 110 b may define an opening and exposes at least a portion of the fourth bonding pad 110 a.

The fourth metal layer 110 d is disposed adjacent to the second active surface 109 a of the second semiconductor element 109. In some embodiments, the fourth metal layer 110 d is disposed adjacent to the fourth bonding pad 110 a. In some embodiments, the fourth metal layer 110 d is disposed within the opening defined by the fourth insulation layer 110 b. The fourth metal layer 110 d may define an opening for accommodating the fourth electrical connector 110 c. In some embodiments, the fourth metal layer 110 d surrounds the fourth electrical connector 110 c. The fourth metal layer 110 d may cover at least a portion of the fourth connector bottom surface 126 b of the fourth electrical connector 110 c.

The fourth metal layer 110 d has a fourth metal top surface 128 a and a fourth metal bottom surface 128 b opposite to the fourth metal top surface 128 a. In some embodiments, the fourth metal top surface 128 a of the fourth metal layer 110 d is substantially coplanar with the fourth insulation top surface 130 a of the fourth insulation layer 110 b. In some embodiments, the fourth metal top surface 128 a of the fourth metal layer 110 d is substantially coplanar with the fourth connector top surface 126 a of the fourth electrical connector 110 c. In some embodiments, the fourth metal top surface 128 a of the fourth metal layer 110 d is substantially coplanar with the fourth insulation top surface 130 a of the fourth insulation layer 110 b and the fourth connector top surface 126 a of the fourth electrical connector 110 c. The fourth metal layer 110 d may be a metal seed layer.

The fourth electrical connector 110 c is disposed adjacent to the fourth bonding pad 110 a. The fourth electrical connector 110 c has a fourth connector top surface 126 a and a fourth connector bottom surface 126 b opposite to the fourth connector top surface 126 a. In some embodiments, the fourth electrical connector 110 c is disposed within the opening defined by the fourth insulation layer 110 b. In some embodiments, the fourth electrical connector 110 c is disposed within the opening defined by the fourth metal layer 110 d. In some embodiments, the fourth electrical connector 110 c is disposed above the fourth bonding pad 110 a. The fourth electrical connector 110 c may be a conductive pillar structure, for example, a copper pillar.

By disposing the fourth metal layer 110 d as having a fourth metal top surface 128 a substantially coplanar with the fourth insulation top surface 130 a of the fourth insulation layer 110 b, the bonding effect of the fourth conductive terminal 110 can be improved as the fourth metal top surface 128 a and the fourth insulation top surface 130 a would constitute a hybrid bonding interface which could improve the bonding strength more than an interface consisted of only one kind of material when bonding to a corresponding bonding structure (e.g., a corresponding hybrid bonding structure such as the second conductive terminal 132). In addition, the fourth metal layer 110 d may enhance the ability of the fourth electrical connector 110 c to resist lateral stress occurred during the formation of the structure, such as, during the bonding annealing process as the fourth metal layer 110 d typically has a higher coefficient of thermal expansion (CTE) than the fourth insulation layer 110 b because of the difference in the materials.

The second conductive terminal 132 may be embedded in and exposed by the first top RDL dielectric layer 118 a. The second conductive terminal 132 may correspond to the fourth conductive terminal 110. The second conductive terminal 132 may include a second bonding pad 132 a, a second insulation layer 132 b, a second electrical connector 132 c, and a second metal layer 132 d. The second bonding pad 132 a, the second insulation layer 132 b, the second electrical connector 132 c, and the second metal layer 132 d are similar to those described for the fourth conductive terminal 110, which are not described repeatedly for brevity. The same fourth conductive terminal 110 may be applied to the first conductive terminal 102 a illustrated in FIG. 1A and the same second conductive terminal 132 may be applied to the third conductive terminal 120 b illustrated in FIG. 1A.

FIG. 2B illustrates an enlarged view of an area B of the fourth conductive terminal 110 and the second conductive terminal 132 of the semiconductor device package of FIG. 1A according to some embodiments of the present disclosure. The bonding structure illustrated in FIG. 2B is similar to that illustrated in FIG. 2A with a difference including that the bonding structure illustrated in FIG. 2B applies a copper to copper bonding technique, rather than a hybrid bonding technique. The fourth conductive terminal 110 and the second conductive terminal 132 illustrated in FIG. 2B are similar to those illustrated in FIG. 2A, with a difference including that the fourth metal layer 110 d does not surround the fourth electrical connector 110 c but the fourth insulation layer 110 b does. In addition, the fourth insulation top surface 130 a of the fourth insulation layer 110 b and the fourth connector top surface 126 a of the fourth electrical connector 110 c are not in the same plane; and the fourth electrical connector 110 c and the second electrical connector 132 c may be surrounded by the second encapsulant 113.

The second conductive terminal 132 illustrated in FIG. 2B may correspond to the fourth conductive terminal 110 illustrated in FIG. 2B, the components of which are not described repeatedly for brevity. The same fourth conductive terminal 110 may be applied to the first conductive terminal 102 a illustrated in FIG. 1A and the same second conductive terminal 132 may be applied to the third conductive terminal 120 b illustrated in FIG. 1A.

The second semiconductor element 109 may electrically connect to and directly bond to the first RDL 103 by the hybrid bonding technique or copper to copper bonding technique as described above. By such technique, the second semiconductor element 109 may be successfully directly bonded to the first RDL 103 by a flip-chip technique without utilizing a solder bump/stud. Therefore, the signal speed may be faster as the hybrid bonding technique allows the second semiconductor element 109 to directly bond to the first RDL 103, which provides a shorter transmission path than a semiconductor element that is bonded to a RDL by a wire bonding technique. In addition, the hybrid bonding technique may avoid the problems that may be caused by using a solder stud/bump, such as a solder contamination problem because of the solder overflow or a RC delay problem caused by the intermetallic coverage between the solder material and other metals.

Moreover, since the second semiconductor element 109 can be successfully bonded to the first RDL 103 by a flip-chip technique by hybrid bonding, the second semiconductor element 109 and the second encapsulant 113 can be thinner by reducing the thickness from the second back surface 109 b of the second semiconductor element 109, which may further reduce the size of the whole package. Therefore, compared to a semiconductor element that is bonded to a RDL by a wire bonding technique, the semiconductor device package of the present disclosure may be thinner.

In addition, the exposed second back surface 109 b of the second semiconductor element 109 may improve the heat dissipation effect and provide flexibility for further attachment of a heat sink to improve the heat dissipation effect more. Moreover, since the hybrid bonding requires less surface area than wire bonding, the electrical connections per surface area can be increased by the hybrid bonding.

FIG. 3 illustrates a cross-sectional view of a semiconductor device package 300 according to some embodiments of the present disclosure. The semiconductor device package 300 is similar to that illustrated in FIG. 1A, with a difference including that the conductive via 307 extends from the second encapsulant top surface 113 a of the second encapsulant 113 to the first encapsulant bottom surface 111 b of the first encapsulant 111 so an electrical signal can be transmitted from one side of the second encapsulant 113 to one side of the first encapsulant 111. In addition, the first seed layer 308 covers at least a portion of the first interface 107 c between the first encapsulant 111 and the conductive via 307. In some embodiments, the first seed layer 308 is disposed in conformity with the first interface 107 c.

FIG. 4 illustrates a cross-sectional view of a semiconductor device package 400 according to some embodiments of the present disclosure. The semiconductor device package 400 is similar to that illustrated in FIG. 1A, with a difference including that the second encapsulant top surface 113 a of the second encapsulant 113 is not in the same plane with the second back surface 109 b of the second semiconductor element 109, which exposes at least a portion of the side surface 109 c of the second semiconductor element 109. Such exposure may improve the heat dissipation effect. In some embodiments, the second back surface 109 b of the second semiconductor element 109 protrudes from the second encapsulant top surface 113 a of the second encapsulant 113.

In some embodiments, the present disclosure provides a method of manufacturing a semiconductor device package including: providing a first semiconductor element; disposing a first redistribution layer adjacent to a first active surface of the first semiconductor element; disposing a second semiconductor element adjacent to the first redistribution layer, wherein a second back surface of the second semiconductor element faces the first redistribution layer; molding the second semiconductor element to form a first encapsulant; forming a conductive via in the first encapsulant; and disposing a second redistribution layer adjacent to a second active surface of the second semiconductor element. According to the method of the present disclosure, a semiconductor device package that can include a conductive via having a higher aspect ratio compared to a conventional one, which in turn results in a higher I/Os, and a semiconductor device package that can achieve superior advantages of a flip-chip technique, including higher I/Os, superior heat dissipation effect and flexibility for further improvement, and reduction of package size, and advantages of a solder-free technique including reducing solder contamination possibilities may be successfully obtained.

FIGS. 5A-5Q illustrate a method of manufacturing a semiconductor device package such as the semiconductor device package of FIG. 1A.

Referring to FIG. 5A, a carrier 515 is provided. The carrier 515 has a first carrier surface 515 a and a second carrier surface 515 b opposite to the first carrier surface 515 a.

Referring to FIG. 5B, a release layer 517 is disposed adjacent to the first carrier surface 515 a of the carrier 515. The release layer 517 may be disposed with a lamination technique, a coating technique, or other suitable process.

Referring to FIG. 5C, at least one first semiconductor element 509 is disposed adjacent to a release top surface 517 a of the release layer 517. At least one first conductive terminal 510 is disposed on the first active surface 509 a of the first semiconductor element 509. The first conductive terminal 510 may be a hybrid bonding structure or a copper to copper bonding structure. In some embodiments, the first conductive terminal 510 is formed by, for example, a combination of a physical vapor deposition, plating, photolithography, etching, lamination (or deposition), or other suitable processes.

Referring to FIG. 5D, a first encapsulant 513 is disposed adjacent to a release top surface 517 a of the release layer 517. The first encapsulant 513 may cover at least a portion of the release top surface 517 a of the release layer 517, at least a portion of the first conductive terminal 510, and at least a portion of the first active surface 509 a of the first semiconductor element 509. In some embodiments, the first encapsulant 513 covers the first conductive terminal 510 and the first semiconductor element 509 entirely (e.g., the first semiconductor element 509 is embedded in the first encapsulant 513). The first encapsulant 513 may be formed by, for example, a molding technique.

Referring to FIG. 5E, a portion of the first encapsulant 513 is removed until at least a portion of the first conductive top surface 510 a of the first conductive terminal 510 is exposed. The first encapsulant 513 may be removed by, for example, a grinding technique, a polishing technique, an etching technique, or other suitable processes.

Referring to FIG. 5F, a first RDL 503 is disposed adjacent to the first encapsulant bottom surface 513 b of the first encapsulant 513. The first RDL 503 may be disposed by a combination of a lamination technique, a photolithography technique, a plating technique, and an etching technique. At least one second conductive terminal 518 b is disposed adjacent to a first top surface 503 e of the first RDL 503 for external electrical connection. The second conductive terminal 518 b may be a hybrid bonding structure or a copper to copper bonding structure.

Referring to FIG. 5G, at least one second semiconductor element 501 is disposed adjacent to a first bottom surface 503 f of the first RDL 503. At least one third conductive terminal 502 is disposed on the second active surface 501 a of the second semiconductor element 501. The third conductive terminal 502 may be a hybrid bonding structure or a copper to copper bonding structure. In some embodiments, the third conductive terminal 502 is formed by, for example, a combination of a physical vapor deposition, plating, photolithography, etching, lamination (or deposition), or other suitable processes.

Referring to FIG. 5H, a second encapsulant 511 is disposed adjacent to the first top surface 503 f of the first RDL 503. The second encapsulant 511 may cover at least a portion of the second conductive terminal 502 and at least a portion of the second active surface 501 a of the second semiconductor element 501. In some embodiments, the second encapsulant 511 covers the second conductive terminal 502 and the second semiconductor element 501 entirely (e.g., the second semiconductor element 501 is embedded in the second encapsulant 511). The second encapsulant 511 may be formed by, for example, a molding technique.

Referring to FIG. 5I, the carrier 515 is removed completely, which should expose the release back surface 517 b of the release layer 517. The carrier 515 may be removed by, for example, a grinding technique, a polishing technique, an etching technique, or other suitable processes.

Referring to FIG. 5J, the release layer 517 is removed completely, which should expose the first back surface 509 b of the first semiconductor element 509 and the first encapsulant top surface 513 a of the first encapsulant 513. The release layer 517 may be removed by, for example, a grinding technique, a polishing technique, an etching technique, or other suitable processes.

Referring to FIG. 5K, a laser drilling process is performed from the second encapsulant bottom surface 511 b of the second encapsulant 511 toward the first bottom surface 503 f of the first RDL 503 to form a via 519 exposing at least a portion of the first bottom RDL conductive trace 504 b of the first RDL 503.

Referring to FIG. 5L, a first seed layer 508 is disposed on the sidewall 507 c of the via 519 of the second encapsulant 511 and on at least a portion of the exposed portion of the first bottom RDL conductive trace 504 b of the first RDL 503. In some embodiments, the first seed layer 508 is disposed in conformity with the shape of the via 519. The first seed layer 508 may be disposed by a plating technique, a physical vapor deposition technique, or other suitable process.

Referring to FIG. 5M, a conductive layer 521 is disposed in the opening 520 defined by the first seed layer 508 and on at least a portion of the second encapsulant bottom surface 511 b of the second encapsulant 511. The conductive layer 521 may fill the opening 520 and cover the first seed layer 508. The conductive layer 521 may be disposed by, for example, a plating technique such as electroplating, or other suitable process.

Referring to FIG. 5N, the first encapsulant 513 and the first semiconductor element 509 may be thinned from the first encapsulant top surface 513 a of the first encapsulant 513 and the first back surface 509 b of the first semiconductor element 509. The thinning process may be performed by, for example, a grinding technique, a polishing technique, or other suitable process.

Referring to FIG. 5O, a portion of the conductive layer 521 is removed until at least a portion of the second conductive terminal 502 is exposed. In addition, a conductive via 507 may be formed. The conductive layer 521 may be removed by, for example, a grinding technique, a polishing technique, an etching technique, or other suitable processes.

Referring to FIG. 5P, a second RDL 505 is disposed adjacent to the second encapsulant bottom surface 511 b of the second encapsulant 511. The second RDL 505 may be disposed by a combination of a lamination technique, a photolithography technique, a plating technique, and an etching technique. At least one fourth conductive terminal 520 b is disposed adjacent to the second encapsulant bottom surface 511 b of the second encapsulant 511 for external electrical connection. The fourth conductive terminal 520 b may be a hybrid bonding structure or a copper to copper bonding structure. In some embodiments, the second RDL 505 electrically connects to and directly bonds to the second semiconductor element 501 through a hybrid bonding or a copper to copper bonding between the fourth conductive terminal 520 b and the third conductive terminal 502. In some embodiments, the fourth conductive terminal 520 b is formed by, for example, a combination of a physical vapor deposition, plating, photolithography, etching, lamination (or deposition), or other suitable processes.

Referring to FIG. 5Q, at least one electrical connector 523 is disposed adjacent to the second bottom surface 505 f of the second RDL 505. In some embodiments, the electrical connector 523 is disposed on (e.g., physical contact or embedded in and exposed by) the portion of the bonding pad 522 b exposed from the second bottom surface 505 f of the second RDL 505 for electrical external connection. The electrical connector 523 may be a solder ball, which may be formed by, for example, a solder ball placement technique or a solder paste printing technique, followed by a reflowing technique. Subsequently, a semiconductor device package (e.g., a semiconductor package 100 as is illustrated in FIG. 1A) may be obtained.

FIGS. 6A-6O illustrate a method of manufacturing a semiconductor device package such as the semiconductor device package 300 of FIG. 3.

Referring to FIG. 6A-6H, the processes illustrated in FIG. 6A-6H for providing the carrier 615, the release layer 617, the first semiconductor element 609, the first encapsulant 613, the first RDL 603, the second semiconductor element 601, and the second encapsulant 611 are similar to those illustrated in FIG. 5A-5H, which are not described repeatedly for brevity.

Referring to FIG. 6I, a laser drilling process is performed from the second encapsulant bottom surface 611 b of the second encapsulant 611 toward a release top surface 617 a of the release layer 617 to form a via 619 exposing at least a portion of the release top surface 617 a of the release layer 617.

Referring to FIG. 6J, a first seed layer 608 is disposed on the sidewall 607 c of the via 619 and on at least a portion of the exposed portion of the release top surface 617 a of the release layer 617. In some embodiments, the first seed layer 608 is disposed in conformity with the shape of the via 619. The first seed layer 608 may be disposed by a plating technique, a physical vapor deposition technique, or other suitable process.

Referring to FIG. 6K, a conductive layer 621 is disposed in the opening 620 defined by the first seed layer 608 and on at least a portion of the second encapsulant bottom surface 611 b of the second encapsulant 611. The conductive layer 621 may fill the opening 620 and cover at least a portion of the first seed layer 608. The conductive layer 621 may be disposed by, for example, a plating technique such as electroplating, or other suitable process.

Referring to FIG. 6L, a portion of the conductive layer 621 is removed until at least a portion of the second conductive terminal 602 is exposed. In addition, a conductive via 607 may be formed. The conductive layer 621 may be removed by, for example, a grinding technique, a polishing technique, an etching technique, or other suitable processes.

Referring to FIG. 6M, a second RDL 605 is disposed adjacent to the second encapsulant bottom surface 611 b of the second encapsulant 611. The second RDL 605 may be disposed in a manner similar to those described for FIG. 5P, which are not described repeatedly for brevity.

Referring to FIG. 6N, the carrier 615 and the release layer 617 are removed completely, which should expose the first back surface 609 b of the first semiconductor element 609 and the first encapsulant top surface 613 a of the first encapsulant 613. The carrier layer 615 and the release layer 617 may be removed by, for example, a grinding technique, a polishing technique, an etching technique, or other suitable processes.

Referring to FIG. 6O, at least one electrical connector 623 is disposed adjacent to the second bottom surface 605 f of the second RDL 605. The electrical connector 623 may be disposed in a manner similar to those described for FIG. 5Q, which are not described repeatedly for brevity. Subsequently, a semiconductor device package (e.g., a semiconductor package 300 as is illustrated in FIG. 3) may be obtained.

As used herein and not otherwise defined, the terms “substantially” and “about” are used to describe and account for small variations. When used in conjunction with an event or circumstance, the terms can encompass instances in which the event or circumstance occurs precisely as well as instances in which the event or circumstance occurs to a close approximation. For example, when used in conjunction with a numerical value, the terms can encompass a range of variation of less than or equal to ±10% of that numerical value, such as less than or equal to ±5%, less than or equal to ±4%, less than or equal to ±3%, less than or equal to ±2%, less than or equal to ±1%, less than or equal to ±0.5%, less than or equal to ±0.1%, or less than or equal to ±0.05%. As another example, a line or a plane can be substantially flat if a peak or depression of the line or plane is no greater than 5 μm, greater than 1 μm, or no greater than 0.5 μm.

As used herein, the singular terms “a,” “an,” and “the” may include plural referents unless the context clearly dictates otherwise. In the description of some embodiments, a component provided “on or “over” another component can encompass cases where the former component is directly on (e.g., in physical contact with) the later component, as well as cases where one or more intervening components are located between the former component and the latter component.

While the present disclosure has been described and illustrated with reference to specific embodiments thereof, these descriptions and illustrations are not limiting. It should be understood by those skilled in the art that various changes may be made and equivalents may be substituted without departing from the true spirit and scope of the present disclosure as defined by the appended claims. The illustrations may not necessarily be drawn to scale. There may be distinctions between the artistic renditions in the present disclosure and the actual apparatus due to manufacturing processes and tolerances. There may be other embodiments of the present disclosure which are not specifically illustrated. The specification and the drawings are to be regarded as illustrative rather than restrictive. Modifications may be made to adapt a particular situation, material, composition of matter, method, or process to the objective, spirit and scope of the present disclosure. All such modifications are intended to be within the scope of the claims appended hereto. While the methods disclosed herein have been described with reference to particular operations performed in a particular order, it will be understood that these operations may be combined, sub-divided, or re-ordered to form an equivalent method without departing from the teachings of the present disclosure. Accordingly, unless specifically indicated herein, the order and grouping of the operations are not limitations. 

1. A semiconductor device package, comprising: a first semiconductor element having a first active surface and a first back surface opposite to the first active surface, wherein the first semiconductor element comprises at least one first conductive terminal disposed on the first active surface of the first semiconductor element; a first redistribution layer disposed above and in contact with the first back surface of the first semiconductor element; a second redistribution layer below the first active surface of the first semiconductor element, wherein the second redistribution layer contacts the at least one first conductive terminal; a conductive via disposed between and in contact with the first redistribution layer and the second redistribution layer, wherein the conductive via has a top surface coplanar with a lower surface of the first redistribution layer; and a second semiconductor element above the first redistribution layer, wherein the second semiconductor element has a second active surface and a second back surface opposite to the second active surface and the second active surface faces the first redistribution layer, wherein the second semiconductor element comprises at least one second conductive terminal disposed on a second active surface of the second semiconductor element and in contact with the first redistribution layer.
 2. The semiconductor device package of claim 1, wherein the first semiconductor element is surrounded by a first encapsulant, and the conductive via is disposed in the first encapsulant.
 3. The semiconductor device package of claim 2, wherein the conductive via and the first encapsulant are connected at a first interface, wherein the first interface has an uneven surface.
 4. The semiconductor device package of claim 21, wherein the first encapsulant comprises fillers, wherein the fillers contacts the seed layer.
 5. The semiconductor device package of claim 21, wherein the first interface has at least one recess, and wherein the seed layer extends in the recess.
 6. The semiconductor device package of claim 22, wherein the second back surface of the second semiconductor element is exposed by the second encapsulant.
 7. The semiconductor device package of claim 6, wherein the second conductive terminal includes a second bonding pad disposed adjacent to the second active surface of the second semiconductor element, wherein the second bonding pad is surrounded by the second encapsulant.
 8. The semiconductor device package of claim 6, wherein the first conductive via extends from the first encapsulant to the second encapsulant.
 9. A semiconductor device package, comprising: a first semiconductor element having a first active surface and a first back surface opposite to the first active surface, wherein the first semiconductor element comprises at least one first conductive terminal disposed on the first active surface of the first semiconductor element; a first redistribution layer above and in contact with the first back surface of the first semiconductor element; a second redistribution layer below the first active surface of the first semiconductor element, wherein the second redistribution layer contacts the at least one first conductive terminal; a first encapsulant encapsulating the first semiconductor element; and a second semiconductor element above the first redistribution layer, the second semiconductor element having a second active surface and a second back surface opposite to the second active surface, wherein the second active surface directly bonds to the first redistribution layer.
 10. The semiconductor device package of claim 9, wherein the second semiconductor element is encapsulated by a second encapsulant, wherein the second encapsulant contacts the first redistribution layer.
 11. The semiconductor device package of claim 10, wherein the second back surface of the second semiconductor element is exposed by the second encapsulant.
 12. The semiconductor device package of claim 10, wherein the second semiconductor element comprises at least one second bonding pad disposed adjacent to the second active surface of the second semiconductor element, wherein the second bonding pad is surrounded by the second encapsulant.
 13. The semiconductor device package of claim 10, wherein the second back surface of the second semiconductor element protrudes from a surface of the second encapsulant.
 14. The semiconductor device package of claim 9, wherein the second active surface directly bonds to the first redistribution layer by a hybrid bonding or a copper to copper bonding.
 15. The semiconductor device package of claim 9, wherein the first semiconductor element directly bonds to the second redistribution layer through the first active surface.
 16. A method for manufacturing a semiconductor device package, comprising: providing a first semiconductor element having a first active surface and a first back surface opposite to the first active surface; disposing a first redistribution layer above the first semiconductor element, wherein the first redistribution layer directly in contact with and electrically connected to the first active surface of the first semiconductor element; disposing a second semiconductor element on and in contact with the first redistribution layer, wherein the second semiconductor element has a second active surface and a second back surface opposite to the second active surface and the second back surface faces the first redistribution layer; molding the second semiconductor element to form a first encapsulant surrounding the second semiconductor element; forming a conductive via in the first encapsulant; and disposing a second redistribution layer on the second semiconductor element, wherein the second redistribution layer directly in contact with and electrically connected to the second active surface of the second semiconductor element.
 17. The method of claim 16, further comprising molding the first semiconductor element to form a second encapsulant surrounding the first semiconductor element before the step of disposing the first redistribution layer.
 18. The method of claim 17, wherein the first conductive via is formed extending from the first encapsulant to the second encapsulant.
 19. The method of claim 16, wherein the step of forming the first conductive via comprises: performing a drilling process to form a via in the first encapsulant; and plating the via.
 20. The method of claim 18, wherein the step of forming the first conductive via comprises: performing a drilling process to form a via extending from the first encapsulant to the second encapsulant; and plating the via.
 21. The semiconductor device package of claim 1, further comprising a seed layer disposed on a sidewall of the conductive via.
 22. The semiconductor device package of claim 1, wherein the second semiconductor element is encapsulated by a second encapsulant, and wherein the second encapsulant contacts the first redistribution layer.
 23. The semiconductor device package of claim 1, wherein the second redistribution layer has a top surface in contact with the first semiconductor element and a lower surface in contact with at least one electrical connector.
 24. The semiconductor device package of claim 9, wherein the first encapsulant has an top surface coplanar with the first back surface of the first semiconductor element, and wherein the first redistribution layer contacts the first back surface of the first semiconductor element and the top surface of the first encapsulant.
 25. The semiconductor device package of claim 1, wherein the first active surface directly bonds to the second redistribution layer by a hybrid bonding. 